DIRTYDOG4x4 Roll Bar covers are made from 100% solution dyed polyester fabric characterized by excellent strength, durability, water resistance, abrasion resistance, dimensional stability, UV resistance and mildew resistance. The fabric we use is made of solution dyed yarns to give you exceptional Color fastness along with no Color rub off to give you years of service while minimizing fading and wear. Replacement Roll Bar Covers for Jeep JKU. Color: Black